stream/stream_udp.c

   1 /*
   2  *  Copyright (C) 2006 Benjamin Zores
   3  *   Stream layer for MPEG over UDP, based on previous work from Dave Chapman
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software Foundation,
  17  *  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 #include "config.h"
  21
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "stream.h"
  26 #include "url.h"
  27 #include "udp.h"
  28
  29 static int
  30 udp_streaming_start (stream_t *stream)
  31 {
  32   streaming_ctrl_t *streaming_ctrl;
  33   int fd;
  34
  35   if (!stream)
  36     return -1;
  37
  38   streaming_ctrl = stream->streaming_ctrl;
  39   fd = stream->fd;
  40
  41   if (fd < 0)
  42   {
  43     fd = udp_open_socket (streaming_ctrl->url);
  44     if (fd < 0)
  45       return -1;
  46     stream->fd = fd;
  47   }
  48
  49   streaming_ctrl->streaming_read = nop_streaming_read;
  50   streaming_ctrl->streaming_seek = nop_streaming_seek;
  51   streaming_ctrl->prebuffer_size = 64 * 1024; /* 64 KBytes */
  52   streaming_ctrl->buffering = 0;
  53   streaming_ctrl->status = streaming_playing_e;
  54
  55   return 0;
  56 }
  57
  58 static int
  59 udp_stream_open (stream_t *stream, int mode, void *opts, int *file_format)
  60 {
  61   URL_t *url;
  62   extern int network_bandwidth;
  63
  64   mp_msg (MSGT_OPEN, MSGL_INFO, "STREAM_UDP, URL: %s\n", stream->url);
  65   stream->streaming_ctrl = streaming_ctrl_new ();
  66   if (!stream->streaming_ctrl)
  67     return STREAM_ERROR;
  68
  69   stream->streaming_ctrl->bandwidth = network_bandwidth;
  70   url = url_new (stream->url);
  71   stream->streaming_ctrl->url = check4proxies (url);
  72
  73   if (url->port == 0)
  74   {
  75     mp_msg (MSGT_NETWORK, MSGL_ERR,
  76             "You must enter a port number for UDP streams!\n");
  77     streaming_ctrl_free (stream->streaming_ctrl);
  78     stream->streaming_ctrl = NULL;
  79
  80     return STREAM_UNSUPPORTED;
  81   }
  82
  83   if (udp_streaming_start (stream) < 0)
  84   {
  85     mp_msg (MSGT_NETWORK, MSGL_ERR, "udp_streaming_start failed\n");
  86     streaming_ctrl_free (stream->streaming_ctrl);
  87     stream->streaming_ctrl = NULL;
  88
  89     return STREAM_UNSUPPORTED;
  90   }
  91
  92   stream->type = STREAMTYPE_STREAM;
  93   fixup_network_stream_cache (stream);
  94
  95   return STREAM_OK;
  96 }
  97
  98 const stream_info_t stream_info_udp = {
  99   "MPEG over UDP streaming",
 100   "udp",
 101   "Dave Chapman, Benjamin Zores",
 102   "native udp support",
 103   udp_stream_open,
 104   { "udp", NULL},
 105   NULL,
 106   0 // Urls are an option string
 107 };